Monoclonal anti-Dsg3 antibodies, especially mAK23, are frequently used for studies on the molecular pathogenesis of pemphigus in cell culture, but mouse antibodies are not capable of interacting with human FcRn, and are therefore not suitable for studying the role of FcRn in pemphigus pathogenesis in human cells [12]. Here, FCGRT is linked to pemphigus.